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[Discuss] On Btrfs raid and odd-count disks

On 4/10/2013 6:30 AM, markw at wrote:
> Its funny, but I never considered an odd number of drives as viable for
> raid1. I guess its simple enough Dn + D(n+1 >= N ? 0 : n+1), but doesn't
> "feel" right.

It does seem odd at first when you're accustomed to block-level RAID. A
block-level RAID system can't use odd quantities of disks in a mirror
set other than as spares. A file-level "raid" system like Btrfs raid can
use them but with some caveats.

Rich P.

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